Concept:Houseflies carry germs from faeces or dirt to food, causing digestive tract infections.
Explanation:Dysentery and cholera are both spread through contaminated food and water.
When houseflies sit on faeces or garbage and then on exposed food, they can transfer the germs that cause these diseases.
Malaria is spread by mosquito bites, not by houseflies.
Tuberculosis is spread through the air by droplets from an infected person, not by food or houseflies.
Therefore, the correct pair is dysentery and cholera.
Answer:C. Dysentery and cholera